From £16,972
Trusted and professional extension builder in TR27. Experienced in all extension buildering work and keeping within budget and on quote. Marks main...
From £17,116
D.P.Hatley Building Services is an established extension buildering business in TR27. We come highly recommended and provide competitive quotes for...
From £16,940
We are a family run Construction Company based in Penzance. We employ over 10 skilled local trade professionals with 2 apprentices as well. Residen...
From £17,028
Trusted and professional extension builder in TR27. Experienced in all extension buildering work and keeping within budget and on quote. D & S Buil...
From £17,164
Searle Construction are here to help customers who need an Extension Builder in TR27. We offer a competitive rate to complete all your extension b...
From £17,404
At peninsula refurbishment we provide a service from start to finish with minimal hassle for the customer. The workmanship is always high priority,...
From £17,284
Need to find an Extension Builder near you for all your extension buildering work?
KPK Builders Ltd provides a local, trusted extension bui...
From £17,292
Need to find an Extension Builder near you for all your extension buildering work?
Samuel Winn Design & Build provides a local, trusted ext...
From £17,244
Trusted and professional extension builder in TR27. Experienced in all extension buildering work and keeping within budget and on quote. Jo Tracey ...
From £17,252
Jackson Developments provides an affordable, quality service for customers across Cornwall.We undertake all aspects of building work and can manage...

Underpinning ranges from £16,940 (TGP Construction based in TR18) to £17,404 (Peninsula Property Refurbishments based in TR15), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in TR27 by posting a job with HaMuch and we will send it to extension builders in TR27.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near St Ives, Cornwall | £25 | £174 |
| Underpin A Building near Camborne | £25 | £177 |
| Underpin A Building near Falmouth | £27 | £183 |
| Underpin A Building near Truro | £27 | £182 |
| Underpin A Building near Newquay | £27 | £193 |
| Underpin A Building near St Austell | £32 | £206 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,170

Two storey extension - £87,504

Build a timber frame extension - £25,670

Build a swimming pool - £80,670

Single storey extension - £48,392

Side return extension - £37,783

Install an RSJ - £1,870

Outbuilding - £9,670

Build a Mansard loft conversion - £51,670

Loft conversion - £30,653

Build a kitchen extension - £41,670

Hip to gable loft conversion - £41,670

Granny annexe - £86,670

Garden office - £9,670

Convert a Garage - £15,670

Garage - £18,170

Build a flat roof extension - £21,670

Build a dormer loft conversion - £41,670

Concrete foundations - £5,920

Convert a bungalow loft - £28,670

Convert a basement - £33,783